Furnace indicator



Oct. 14, 1930. vw H. wlNEMAN 1,778,653 I FURNACE INDICATOR Filed Jne 9,1922.

Patented Oct. 14, 1930 unlerici;

WADE H. WINEMAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO SULLIVAN MACHINERYCOMPANY, A CORPORATION OF MASSACHUSETTS FURNACE INDICATORApplicatonflled .Tune 9, 1922. Serial No. 56132189.

My invention relates to furnace indicators. It has for its object toprovide an improved indicator, especially adapted to use in connectionwith such articles as drill steels, or the like, which will indicatewhen the article under heat has reached the desired temperature. Afurther object of my invention is to provide an improved indicator ofthe character set forth which is accurate and certain in operation, of asimple and rugged construction adapted to withstand the rough usage towhich such a. device is subjected in ordinary service, and which is alsoadapted to be manu` factured at small expense.

ln the accompanying ldrawings l have shown for purposes of illustrationone embodiment which my invention may assume in practice.

In these drawings,-

Fig. 1 is a front view of one form of my improvement, a portion of thecover being broken away to facilitate illustration.

Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1 with a drillsteel shown in dotted lines in operative position.

Fig. 3 is a transverse sectional view on line 3 3 of Fig. 1. 1

In this illustrative construction I have shown an upstanding frame 1having a laterally extending support 2, herein a plane shelf, its lowerend and suitably attached thereto, herein formed integral therewith, thelateral support 2 being adapted to support an article to be tested whenlaid horizontally thereon in adjacency to improved abutment andtemperature indicating means carried by the frame 1 and hereinafterdescribed.

Referring more particularly to the member 1, it will be noted that it isherein formed of a non-magnetic material such as brass and provided withan internal chamber` 3. Disposed vertically in this chamber 3 is amagnet 4, herein of the horse-shoe permanent magnet type, pivotedbetween its ends for a limited movement on adjustable steel knife edgetriangular pivots 5 carried on the frame 1 and suitably held in place byset screws 5. Herein this magnet has its poles 6 disposed at the lowerend of the chamber 3 and movable on opposite sides of an upstandingpartition member 7 of non-magnetic material formed on the back wall ofthe chamber 3 and projecting to the front of the latter. As

shown in Figs. 1 and 2, the magnet 4 also carries upon its upper end anupstanding member 8, herein of brass, projecting upwardly therefrom andherein having a curved end 9 adapted to contact with an elbow lever 10which is in turn pivoted at 11 on a transverse pivot on the back wall ofthe chamber 3 and carries on its front end an indicator 12 adapted to bemoved into and out of operative position in front of an aperture 13 andglass 14 carried by a cover l5. rhe location of the pivot relative tothe center of gravity of the magnet and the weight of the upstandingmember 8 give to the magnet a slight tendency towards clockwise turning,as viewed in Fig. 2, butthis is overcome by the weight and leverage ofthe indicator 12 so that unless the poles of the magnet are influencedby a magnetic body the upper end of the magnet rests lightly against aportion ofthe cover 15. It will thus be clear that with this arrangementof parts the center of gravity of the magnet G and member 8 lies to therear of andmoves away from a vertical plane including the pivots of ,themagnetwhen the latter swings due to the ,approach of a` magnetic body.Herein, it

will be noted that the cover 15 seals the chamber 3 and is attached tothe member 1 by suitable means, such as screws 16, and removable topermit access to the parts inside the chamber whenever desired, whilethevglass is carried in a suitable casing 17 likewise removablyattached, as by screws 18, to the cover. It will also be noted thatherein the lower end of the cover 15 presents an up- `aiding abutment 19of non-magnetic mal fer the articles te be tested, although obviously aseparate abutment plate may be used if desired, and that the abutment,and herein thewhele cover, is formed of a nonmagnetic yet conductingmaterial, such as bra-ss. Attention is also directed to the fact thatthe abutment is braced by the member 7 in such manner as to preventdamage thereto and also does not extend down quite to the level of thesupporting surfaces of the member 2, a suitable transverse groove 2()being provided between the adjacent extremities of the members 2 and 19.

In the operation of my improved construction it will be evident thatwhen it is desired to determine the temperature of a steel or otherobject under treatment in a furnace, it is only necessary to place theend of the object on the support f2 with its extremity preferablyclosely against the lower outer face of the abutment 19. Iith thearticle to be tested in this uosition, if the temperature has notreached the desired point previously determined., i. e. where it losesits magnetic quality. the magnet 4 will be influenced, the lines offorce then passing between the poles thereof. the non-magnetic abutment19.. and the steel. As a result the magnet 4 will be attracted to theobject and swing about its pivot toward the article under test. movingits member 9 toward the right in Fig. 2 and thereby throwing up themember 10 and indicator 12 so that the indicator will be in front of theglass le and visible to an operator who will thus be advised thatfurther heating' is required. If, however, the steel has reached thecritical point desired, i. e. at which it loses its magnetic quality,the indicator will not be operated and the operator will then know thatno further heating is required.

As a result of my improvement, it is made possible to obtain greatercertaintly of open ation. Attention is also directed to that fact thatit is made possible for the operator to insure accu `ate positioning ofthe article relative to the magnet, the groove 20 permitting the objectalways to be brought into the same position against the abutment despitethe presence of flaring extremities on the article or scale whichotherwise, through interfering with the desired location of the articlesin the same position, would thereby cause the indicator to functionirregularly. It will also he noted that the entire mechanism whilethoroughly enclosed, is readily accessible whenever desired to permitreplacement or repair and tl at the indicator mechanism whileexceedingly accurate is of such a simple aud rugged mechanical characteras to permit it to be kept in repair by the avera furnace tender orrepair man.

While I have in this applica-tion speciiicah lv described one embodimentwhich my invention may assume in practice it will be understood thatthis form of the same is shown for purposes of illustration and that theinvention may be modified and embodied in other forms without departingfrom its spirit or the scope of the appended claims.

That I claim as new and desire to secure by Letters Patent is:

l. A magnetic heat indicator including a frame presenting' a lateralarticle support and an upstandingarticle abutment, a magnet movablethereon and having its poles disposed adjacent said abutment, and aspacing member between said poles extending into adjacency to onesurface of said abutment.

2. In a magnetic heat indicator, an upstanding chambered member, anupstanding magnet disposed in the chamber therein and pivoted betweenits ends on ay transverse pivot, an indicator in said chamber above saidmagnet and operated upon movement thereof, and means for covering saidchamber presenting an indicator opening and including an articleabutment in front of both of the magnet poles in said chamber.

3. In a magnetic heat indicator, an upstanding chambered memberpresenting a laterally extending article support at its lower end, anupstanding magnet disposed inthe chamber therein and pivoted between itsends on a transverse pivot, a spacing member between its poles, anindicator in said chamber above said magnet and operated upon movementthereof, and means for covering said chamber presenting an indicatoropening and including an article abutment in front of the magnet polesin said chamber.

t. A magnetic temperature indicator comprising a frame, a magnetpivotally mounted on said frame, a. member fixed to said frame adjacentsaid pivoted magnet and providing an abutment surface against which anarticle to be tested may be placed to locate the same with reference tosaid ma gnet, a shelf carried by said frame having a supporting surfaceupon which such article may be supported during testing, and anindicator device coutrolled by pivotal movement of said magnet.

5. In a magnetic temperature indicator, the construction set forth inclaim t wherein said aluitmcnt surface and said supporting surface areeach in a plane parallel to the axis of pivotal movement of said magnet.

6. A magnetic temperature indicator comprising a, frame, a magnetpivotally mounted on said frame in a vertical plane to swing about ahorizontal axis, a member fixed to said frame adjacent said pivotedmagnet and providing a vertical abutment surface against which anarticle to be tested may be placed to locate the same wit-h reference tosaid magnet, a shelf carried by said frame having a horizontalsupporting surface upon which said article may be supported duringtesting, means at the junction of said surfaces providing a transversegroove, and an indi cator device controlled by pivotal movement of saidmagnet.

i'. A magnetic temperature indicator comprising a frame having wallsdefining a chamber, a magnet arranged in said chamber and pivot ivmounted on the frame. an abut-ment member fixed to the frame adjacentsaid pivoted magnet and providing an abutment surface against which anarticle to be tested may be placed to locate the same with reference tosaid magnet, a non-magnetic reinforcing member disposed in said chamberadjacent said pivoted magnet for maint-aining said abutment member infixed relation to the pivot of said magnet, and indicator meanscontrolled by pivotal movement of said magnet.

8. A magnetic temperature indicator comprising a frame, a horseshoemagnet pivotally mounted on said frame, a member fixed to said frameadjacent the poles of said magnet and providing an abutment surfaceagainst which an article to be tested may be placed to locate the samewith reference to said magnet, a non-magnetic reinforcing member iiXedto the frame between the poles of said magnet for maintaining saidabutment member in fixed relation to the pivot of said magnet, andindicator means con- U trolled by pivotal movement of said magnet. 9. Ina magnetic temperature indicator comprising a frame having Wallsdefining a chamber, a magnet arranged in said chamber and pivotallycarried by said frame, a non-magnetic abutment member fixed to saidframe adjacent said pivoted magnet and having an abutment surfaceagainst which an article to be tested may be placed to locate the samewith reference to said magnet, a :m shelf carried by said frame having asupporting surface upon which said article may be supported duringtesting, a non-magnetic spacer member disposed in said chamber betweensaid abutment member and one of the s Walls of said chamber formaintaining said abutment member in fixed spaced relation to the normalposition of said magnet, and indicator means controlled by pivotalmovement of said magnet. u, In testimony whereof I aiix my signature.

WADE H. WINEMAN.

